Road miller



D .12 1939 GLEDHILL 2 1 3 09 ROAD MILLER Filed Aug. 3, 1938 5 Sheets-Sheet 1 Dec. 12, 1939. E. c. GLEDHILL ROAD MILLER Filed Aug. 3, 1938 5 Sheets-Sheet 2 HE --i 5 Sheets-Sheet 3- Dec. 12, 3.939. E. c. GLEDHZLL- ROAD MILLER Filed Aug. 3, 1938 1 1 III. a mm mm 12, 1939. E. c. GLEDHILL ROAD MILLER Filed Aug. 3, 1938 5 Sheets-Sheet 4 Dec. 12, 1939. GLEDHLL 2,183,098

ROAD MILLER Filed Aug. 3, 1938 5 Sheets-Sheet 5 Patented Dec. 12, 1939 I sm ROAD- MILLER Edward C. Gledhill, Gallon, Ohio Application August 3, 1938, Serial No. 222,915

10 Claims.

This invention relates to an improved road miller.

One of the objects of my present invention is to provide a road miller which will be effective in operation for milling down a road surface so that undesirable uneven surfaces or obstructions thereon will be removed.

Another object of the invention is to provide road miller having a motor driven rotor with 14% milling teeth thereon, which rotor may be adjusted so that the depth of cut of the milling teeth may be varied to suit particular conditions. A further object of the invention is to provide a road machine of this character wherein the rotor teeth are so mounted that, should one or more of them engage obstruction too deep set to be removed and too hard to be milled down, said tooth will be permitted to stop and to slip on the rotor shaft with the result that injury to the af- 20 feoted tooth will be avoided and operation of the unobstructed teeth will not be affected.

As a further object, theinvention seeks to provide a road miller having a main frame, a subframe, and a milling rotor, the sub-frame and milling rotor being movable as a unit with respect to the main frame, into and out of operative position, and the milling rotor being adjustable on the sub-frarne.

A still further object of the invention is to pro- 7 vide a road miller having mounted on the main frame thereof a power plant and transmission which will be operable for rotating the rotor at the desired rate of speed for any particular road milling operation. The invention contemplates other objects which will become apparent during the course of the following description.

My invention is illustrated in the accompanying drawings forming a part of this application. 4a In the drawings:

Figure l. is a side elevation of my improved road miller.

Figure 2 is a top plan view of the machine. Figure 3 is an enlarged detail side elevation showing particularly the adjustable mounting for the rotor and driving means therefor.

Figure 2 is a vertical sectional view on the line lt of Figure 1.

Figure 5 is a detail top plan view showing one so of the milling teeth employed.

Figure 5 is a longitudinal sectional View of one of said milling teeth.

Figure 7 is a vertical sectional view on the line 'll of Figure 6. 55 Referring now more particularly to the draw hound l.

ings,wherein similar numerals of reference will be seen to designate like parts throughout the several views, reference is first had toFigures 1' and 2 of the drawings. The numeral l indicates,

,in general, the main frame of my improved road 5 miller. The main frame includes channeled supporting members 2 and 3 which are disposed in parallel spaced relation and extend throughout the major portion of the length of the machine. The members 2 and 3 are connected at their cor- 10 responding forward ends by a front brace or fore Pivotally mounted on the front brace 4 is a frontwheel assembly 5 having a tongue 6 connected therewith. The tongue is intended for connection with a truck or other source of tractive effort.

At the rear, the members 2 and 3 of the main frame are provided with braces l which are fixed at their corresponding lower ends to a rear axle 8. The rear axle is provided with rear wheels 9 and l B rotatably mounted on the free ends thereof. Braces l i extend from the axle obliquely upwardly and are secured to the members 2 and El forwardly of their corresponding rear ends.

Mounted between the members 2 and 3 between electric motor may be employed if found prac- I ticable and desirable. A hood l3 overhangs the motor and provides shelter therefor. A gasoline supplytank is shown at M and a transmission lever at E5. The transmission lever is, of course, connected to the transmission it of the power plant ill and is adapted to control motion of said power plant.

Associated with the main frame l is a sub-frame H3. The sub-frame includes runner frames l9 and Eli. As best seen in Figure 2, the runner frames are located in parallel spaced relation at opposite sides of the main frame. Inasmuch as said runner frames are identical in construction, a description of one will suffice for both. A typi cal runner frame includes a substantially inverted 5 U-shaped sub-frame member 2! having a straight portion 22 and inclined end portions 23 which have their corresponding lower ends connected to runners 24. Vertically disposed braces 25, 26, 2? and 28 connect the runners 24 with the sub-frame member 22 and provide a rigid runner frame structure.

Mounted on the runner frame, medially of the length thereof, are guideposts E9 and 30 which are vertically disposed and slidably mount a vertically adjustable carriage 3|. The carriage 3| includes a web 32 and a hub portion 33, which Web is formed with a vertical projection 34 adapted to have mounted therein a nut 35 which is internally threaded to receive the shank 36 of an adjusting bolt 37 formed with a manually engageable wheel 38, which wheel and bolt are threaded through the straight portion 22 of the inverted U-shaped sub-frame member 2|. It will be understood that rotation of the bolt 37 will effect raising and lowering of the carriage 3! on the guides 29 and 30.

The runner frames [9 and 25 are connected with the central portion of the sub-frame l8 by means of a plurality of levers. By referring particularly to Figure 2 of the drawings, it will be seen that the sub-frame includes cross members 39 and 4B which are welded or otherwise secured to the members 2 and 3 of the main frame and are disposed in parallel spaced relation to each other. The cross members 39 and 40 are connected at their free ends by rods 4! and 42 which rods are rotatably mounted at their corresponding ends in the corresponding free ends of the members 39 and 4D. The rods 4! and 42 have levers 43 fixed thereto, which levers comprise parallel spaced members Q4 and 45. It will be seen that the rods Al and 42 each have one of these levers 43 at each of their corresponding end portions and these levers 43 are pivotally connected with the runner frame by relatively long levers 4B which have their lower corresponding ends pivotally connected to the runner frame by means of yokes 41. Medially of the length of the rods 4| and 42 there are mounted raising levers 48 and 49.

Mounted on the main frame I between the cross members 39 and 48 are jack supporting beams 50 and 5! substantially L-shaped in formation. The beams have extending therebetween the guide rods 52 and 53. A hydraulic jack cylinder 54 is carried by the beam 5| and has a piston rod 55 extending through one end thereof in parallel spaced relation to the guide rods 52 and 53. A cross head 56 is carried on the end of the piston rod 55 and has its free ends slidable on the guide rods 52 and 53. Pulleys 5? and 58 are mounted on brackets 59 (see Fig ure 4:) and said pulleys have trained thereabout cables and 6!. The cables have corresponding inner ends connected with the cross head 56 and corresponding outer ends connected with the levers t8 and 49. A source of hydraulic pressure is shown in Figure 1 at 62 and this source of pressure is, of course, connected with the cylinder 54.

It will be understood that when the jack cylinder 54 has hydraulic pressure introduced therein, the piston rod 55 will be urged outwardly for forcing the cross head forwardly toward the member The cables 69 and 55! will be pulled about the pulleys 5'! and 58 for rocking the raising levers 48 and 49 inwardly, when the rods 4! and G2 will be rotated and the levers 53 and 48 will be lifted for lifting the runner frames clear of the ground so that the wheels 5, 9 and ll] will be allowed to support the machine for transporting the same from place to place. When it is desired to lower the runner frames it is only necessary to reduce the hydraulic pressure, when the weight of the runner frames will cause the levers to be pulled in an opposite direction and the cross head and piston rod to move toward the jack cylinder 54 in inoperative position.

For effecting the actual road milling operation,

I employ a rotor, shown generally at 63. The rotor includes a shaft 64 which has its opposite end portions extending through the corresponding free end portions of the mounting frame, shown generally at B5. The shaft 64 extends further into the hub portion 33 of the carriage 3| of the runner frames [9 and 20. Mounted on the shaft 64 between the ends of the mounting frame are milling teeth 56. The milling teeth are of identical construction and in View of this fact a description of a typical milling tooth will be sufficient to embrace all of said teeth. The construction and mounting of a typical tooth is shown in Figures 5, 6 and 7 of the drawings. It will be seen that the milling tooth 66 comprises tooth sections 6? and 68 each of which comprises one-half of a tooth. The sections 57 and 68 are adapted to fit about the shaft 64 in close frictional engagement therewith and in such a manner that should one of the teeth strike an obstruction, said tooth will be permitted to stop and operation of the remaining teeth on the shaft, as well as rotation of the shaft 6, will not be affected. The tooth sections 6i and 68 are substantially hemispherical in cross section and substantially rectangular in top plan (see Figure 5 of the drawings). The sections each include tooth members 69 extended in opposite directions in the same longitudinal plane and in planes parallel with each other. The tooth members 69 comprise flat portions 15 and web portions II and 12, which web portions are tapered from a point on the surface of the members toward the free ends of the tooth members. The tooth sections are connected to each other by means of bolts 13, preferably four in number. The bolts extend through corresponding flanges on one tooth section into mating flanges on the other tooth section, it being understood that certain of the bolts pass through the flat portions 'Hl of the tooth members 69. Springs 14 surround the free end portions of the bolts 73 and have washers 15 and nuts 76 hearing thereagainst. It will be seen that by tightening the nuts T6, the spring 14 will be compressed and the tooth sections 67 and 68 drawn toward each other and into tight frictional engagement with the shaft 64. The tooth members 61 and 68 are undercut at their free end portions, as shown at TI, and define pockets terminating in shoulders 18. The pockets receive tooth points 19 and said tooth points are held in place in the pockets by bolts 80 and nuts 8|. The tooth points 79 are preferably rectangular in shape and are formed of very hard metal. These tooth points are, of course, adapted to engage the surface to be milled and must, necessarily, be of such formation as to withstand resistance and shocks offered by obstructions to be milled. It will be observed that each tooth 66 is formed with two tooth points and that the points are arranged in planes parallel with each other so that a complete rotation of a tooth will effect the cutting or milling of a path equivalent to the width of the entire tooth. Bushings 82 and 83 are carried on the shaft 64 and serve to retain the teeth 68 in proper relative position on the shaft. Mounted on the shaft 64 adjacent the free end portions of the mounting frame 85, are sprocket wheels 84 and 85, the purpose of which will be presently described.

The mounting frame 65 is best shown in Figures 2, 3 and i of the drawings, and comprises mounting bars 36 and 81. The mounting bars are formed from inverted L-shaped metal members and include obliquely disposed straight portions 8E5 and 89 which terminate at their inner corresponding ends in straight connecting portions Q9 and 95, which portions 96 and 9!, as seen in Figures 1 and 3, are formed with longitudinally extending slots The connecting. portions fill and flare disposed in parallel spaced relation to each other and in straddling relation to a universal joint which is connected with the transmission it of the motor l2. The universal joint has extending laterally therethrough a connecting pin fi l which is slidably engageable in the slots 92 of the straight portions 9d and 95. The obliquely disposed portions 88 and 89 terminate in straight free end portions 95 and The free end portions, as heretofore described, journal the end portions of the shaft 64 and bearings ill and 98 are formed on the free ends of said portions 95 and $6 for the purpose of effecting the jour}- naling of said shaft ends. Mounted on the'free end portions and 9t and the bearings 91 and 8 are bearing standards 99 and ifiii. A typical bearing standard, as best seen in Figure 3, com-- prises substantially vertically extending portions iii! and 592 connected by a Web 6513. A fiat upper surface Hi l is provided for the top of the bearing standard. Bearings Hill"; and Fill; are carried on the flat upper surfaces Hi l of the bearing standards and journal the free ends of driving shafts is? and 5638 which form part of a differential mechanism N39. The differential mechanism includes a housing H0 and shaft housings iii and H2. Fixed on the shafts ifl'l and 198, between the end portions of the shaft housings ill and M2 and the bearings Hi5 and 6%, are driving sprockets H3 and H4 which, as will be noted, are disposed in vertical alinement with the sprockets 84. and on the shaft 64. Sprock- *et chains H5 and H5 'operatively connect the sprocket i lit with the sprocket 8G and the sprock et lid with the sprocket $5, respectively. A torque tube i l? is connected with the difierential' housing and extends'forwardly in close proximity with the universal joint 93. The torque tube houses a driving shaft lit which is, of course, connected to the universal joint.

The operation of the invention should be tin-- derstood from the foregoing description but a brief discussion of the operation is not thought to be out of place. My improved road miller is first connected to a source of motive power by means of the tongue ii and is drawn to the area to be milled, it being understood, of course, that during transportation the runner frames, together with ment of the mounting frame which would be cc 1 casioned by vertical and not arcuate movement of the carriage iii. The depth of cut of the rotor teeth $6 is, course, regulated by shifting the carriages iii with respect to the runner'frames by means of the bolts 3?. After the motor 52 is started and the transmission lever is thrown into operative position, the sprocket chains H5 and i it will be caused to transmit rotative movement from the shafts it! and its to the shaft 94, when the teeth 56 will be caused to bite into the surface to be milled for effecting the milling operation. Should one of the teeth encounter an object too deeply set or too hard tobe milled, said tooth will stop and slip about the shaft 6:2 until said obstruction has been cleared... When this takes place, however, the remaining teeth will continue to operate properly on the shaft fi l so that but one of the teeth, i. e.,' the tooth obstructed, will be affected. After the milling operation has been completed, the hydraulic mechanism 62 may be actuated for raising the runner frames and, therewith, the rotor shaft and teeth, when the machine may be hauled away. I

Although my improved road miller is in intended .to be attachedto asource of power, during a milling operation, it has been found that rotation of the shaft 54 and constant engagement of the milling teeth with the. ground will cause the machine to move over the ground while a milling operation is taking place and without regard to the source of pulling power. It is believed that the construction and operation of my improved road millerwilllnow be thoroughly understood so that further description is unnecessary.

Havingthus described the'invention, what I claim is:

1. In a road miller, a main frame having wheels and a tongue to be connected to a source of mo tve power, a motor carried by the main frame,

motor, a rotor having a shaft journaled in. the 4 mounting frame and in the runner frames, teeth carried by the rotor, bearings carried by the mounting frame and disposed above the ends of the rotor, a differential mechanism carried'by the mounting frame and having shafts journaled in l the bearings, said differential mechanism having a drive shaft connected with the motor, means operatively connecting the difierential shaft with the rotor whereby rotative movement from the motor will be transmitted to the rotor shaft for engaging the teeth with a surface to be milled, and means'for'adjusting the rotor shaft and teeth with respect to the runner frames thereby adjusting the depth of cut of the teeth.

2. In a road miller, a main frame having parallel bars-and a fore-hound, wheels carried at the forward end of the frame, wheels carried at the rear end of the frame, a motor carried by the frame between the bars and having a transmission and a universal joint, a sub-frame, runner frames associated with thesub-frame, means for raising and lowering the runner frames with respect to the sub-frame and a surface to be milled, a mounting frame having members swingingly connected with the universal joint, said members having free end portions connected with the runner frames, bearing standards carried by the members of the mounting frame and having bearings thereon, a differential having shafts journaled in the bearings, a rotor carried by and extending between the runner frames, means operatively connecting the rotor with the differential shafts, teeth carried by the rotor for effecting a milling operation when in motion, a drive shaft connecting the differential shafts with the motor,

and means for adjusting the mounting shaft and rotor with respect to the runner frames whereby the depth of cut of the rotor teeth may be adjusted to suit conditions.

3. In a road miller, a main frame, a motor carried thereby, a sub-frame, runner frames associated with the sub-frame, said sub-frame including runners and substantially inverted U- shaped sub-frame members, said runner frames having braces and spaced guide posts, carriages carried by and extending between the guide posts. a mounting frame connected with the motor and having end portions disposed adjacent the carriages, a rotor having a shaft extending through the end portions of the mounting frame and into the carriages, an adjusting bolt for shifting the carriages on the guide posts whereby the rotor shaft will be raised or lowered with respect to the runner frames and the mounting frame will be swung with respect to the main frame and motor, teeth carried by the rotor shaft, and means operatively connecting the rotor shaft with the motor for effecting a road milling operation, said adjustable carriages permitting adjustment of the depth of cut of the rotor teeth.

4. In a road miller, a main frame having spaced bars, wheels carried by the main frame at its forward end, a motor carried by the main frame between the bars and having a universal joint, a sub-frame carried by the main frame at right angles thereto, runner frames associated with the sub-frame and the main frame and disposed in parallel spaced relation to each other, means operatively connecting the runner frames with the sub-frame, means carried by the main frame and operable for raising and lowering the runner frames with respect to the sub-frame and the main frame, carriages carried by the runner frames, a rotor having a shaft extending between the runner frames and having end portions journaled in the carriages, a mounting frame having end portions journaling the end portions of the rotor shaft, opposite corresponding end portions of the mounting frame being pivotally connected to the universal joint, teeth carried by the rotor, bearing standards carried by the mounting frame and disposed above the rotor, bearings carried by the bearing standards, a differential having shafts with their end portions journaled in the last mentioned bearings, means operatively connecting the shafts with the rotor shaft, means connecting the shafts with the motor for conducting rotative movement through all of said shafts to the rotor for rotating said rotor and engaging the teeth thereof in a road milling operation, and means carried by the runner frames and carriages for shifting said carriages with respect to the runner frames whereby the depth of cut of the rotor teeth may be adjusted.

5. In a road miller, a rotor tooth comprising mating sections, means connecting said sections to each other and binding said sections as a unitary tooth in tight frictional engagement about a rotor shaft, and tooth points removably connected with the tooth sections.

6. In a road miller, a rotor tooth comprising mating tooth sections having hemispherical portions and tooth members extending in opposite directions and in parallel longitudinal planes, means connecting the tooth sections and binding said sections as a unit in tight frictional engagement about a rotor shaft, and tooth points carried by the tooth members and engageable with a surface to be milled upon rotation of the tooth and rotor shaft.

'7. In a road miller as recited in claim 6, wherein the means comprises bolts extending through flanges on the tooth sections and through the inner end portions of the tooth members, springs surrounding the bolts, and nuts compressing the springs and urging the tooth sections toward each other.

8. In a road miller, a main frame having spaced bars, a motor carried by the main frame between the bars, wheels for the main frame, a universal joint for the motor, a sub-frame carried by the main frame and being disposed at right angles to said main frame, rods carried by the subframe, raising levers carried by the rods, hydraulic mechanism carried by the main frame and including a hydraulic jack cylinder, a piston and a cross head, cables operatively connecting the cross head with the raising levers, runner frames, levers connecting the rods with the runner frames, said raising lever and last mentioned levers and the rods raising the runner frames with respect to a surface to be milled upon operation of the piston of the hydraulic mechanism, carriages carried by the runner frames, means for adjusting the carriages vertically on the runner frames, said carriages having hub portions, a rotor having a shaft having its end rtions journaled in the hub portions of the carriages, a mounting frame swingingly connected with the universal joint and having end portions journaling the end portions of the rotor shaft, teeth carried by the rotor shaft, bearing standards carried by the mounting frame, bearings carried by the bearing standards, a differential having shafts with their end portions journaled in the last mentioned bearings, spookets carried by the last mentioned shafts, sprockets carried by the rotor shaft, sprocket chains operatively connecting the sprockets, and a drive shaft connecting the differential with the motor, said drive shaft and differential shaft transmitting rotative movement through the sprockets and sprocket chains to the rotor for rotating said rotor whereby the rotor teeth will be caused to effect a road milling operation, vertical adjustment of the carriages effecting adjustment of the depth of cut of the rotor teeth,

9. In a road miller, a main frame, a subframe carried thereby, runner frames carried by the sub-frame, rotatable milling means carried by the runner frames, a power source on the main frame for rotating the milling means, and hydraulically operated means carried by the main frame and operable for shifting the runner frames and milling means with respect to the sub-frame and main frame.

10.111 a road miller, a main frame, a subframe carried thereby, runner frames carried by the sub-frame, milling means rotatably mounted on the runner frames and adjustable thereon, a power source on the main frame for rotating the milling means, and hydraulically operated means carried by the main frame and operable for shifting the runner frames and milling means with respect to said main frame and sub-frame.

EDWARD C. GLEDHILL. 

